dom dataset getAttribute

 <ul>
      <li data-src="srcvalue" id="myLi">123456</li>
    </ul>

  <script>
      var myLi = document.getElementById('myLi');

      //var newDom = document.createElement('p');
      //  document.write(newDom.outerHTML);
      // document.body.append(newDom);
      //newDom.innerHTML = 'hello222';

      // document.write(myLi.getAttribute('data-src'));      right  native getAttribute
      // document.write($(myLi).attr('data-src'));     right , jquery  dom.attr
      document.write(myLi.dataset);       right
    </script>